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New Alstom charging system launched

The SRS charges in less than 20 seconds at stations with power from supply cabinets embedded in stations

July 2015

Alstom has launched its SRS (Stationary Recharge Solution), a breakthrough ground-based power charging solution for both trams and electrical buses. The company also announced the extension of the APS’s (ground-level power supplier) application to hybrid trucks.


SRS is based on the technology and safety principles of the proven Alstom APS solution used by Citadis trams. Whereas APS supplies power to the tram while it is still running, SRS charges the tram when stopped at stations in less than 20 seconds. Electrical power comes from compact power supply cabinets that are smoothly and easily integrated into stations. Collector shoes (contact blocks), fitted under the tram, make contact with the conductor rail, providing electric traction power to the tram. Supercapacitors installed on the roof of the tram store energy via a ground-based conductive rail which provides traction power to the vehicle through the collector shoes.


SRS is also designed to address the road market by supplying power to electrical buses through ground-based charging slots at stations. It can be used by a large range of electrical buses.


Alstom is also extending the use of its APS solution to hybrid trucks. This was developed as a collaborative project, called ‘Electrical Road Systems’, between Alstom and Volvo. The research conducted by the two companies involves a method based on two power lines built into the surface of the road. This allows supplying electricity to trucks as they drive along the road via a current collector located on the vehicle. The technology has been undergoing tests since 2012. The tests will continue until the end of the programme, scheduled for the end of 2015.


“As a pioneer and leader in the supply of catenary-free power solutions for trams, Alstom is pleased to extend its offer and adapt its technologies to road transport vehicles for a greener environment,” declared Cristina Anderiz, Alstom Transport vice president for infrastructure.


Alstom is the only manufacturer with the broadest and most reliable range of catenary-free solutions including APS, on-board batteries, supercapacitors and SRS, to ensure the proper architectural integration of trams into city centres. For improved efficiency, these different technologies can be combined, as will be the case for the Citadis tramway system of Rio (Brazil) which will run 80 per cent on APS and 20 per cent on supercapacitor. Alstom’s catenary-free trams have covered more than 99 per cent of the total distance covered without catenary in the world.




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